public class Test {
    public static void main(String[] args) {
        BinaryTree binaryTree = new BinaryTree();
        BinaryTree.TreeNode ret = binaryTree.createBinaryTree();

        System.out.println(binaryTree.isCompleteTree(ret));

        System.out.println(binaryTree.lowestCommonAncestor2(ret, ret.left.left, ret.left.right.right).val);
    }
}
